/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c


--------------------------------------------------------------------------------


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 18:52:22,476 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 18:52:22,479 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 18:52:22,504 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 18:52:22,504 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 18:52:22,505 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 18:52:22,506 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 18:52:22,508 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 18:52:22,510 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 18:52:22,510 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 18:52:22,512 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 18:52:22,513 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 18:52:22,513 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 18:52:22,514 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 18:52:22,515 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 18:52:22,516 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 18:52:22,517 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 18:52:22,518 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 18:52:22,520 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 18:52:22,521 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 18:52:22,523 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 18:52:22,524 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 18:52:22,525 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 18:52:22,526 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 18:52:22,529 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 18:52:22,529 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 18:52:22,529 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 18:52:22,530 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 18:52:22,530 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 18:52:22,534 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 18:52:22,534 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 18:52:22,535 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 18:52:22,537 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 18:52:22,538 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 18:52:22,539 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 18:52:22,539 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 18:52:22,541 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2020-08-18 18:52:22,541 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-18 18:52:22,543 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 18:52:22,544 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-08-18 18:52:22,594 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 18:52:22,594 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 18:52:22,595 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 18:52:22,599 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 18:52:22,599 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 18:52:22,599 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 18:52:22,599 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 18:52:22,600 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 18:52:22,600 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 18:52:22,600 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 18:52:22,600 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 18:52:22,600 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 18:52:22,601 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 18:52:22,602 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 18:52:22,602 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 18:52:22,602 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 18:52:22,603 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 18:52:22,603 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 18:52:22,603 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 18:52:22,603 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 18:52:22,603 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 18:52:22,604 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 18:52:22,604 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 18:52:22,604 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 18:52:22,604 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 18:52:22,604 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 18:52:22,605 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 18:52:22,605 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 18:52:22,605 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 18:52:22,605 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER;
[2020-08-18 18:52:22,944 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 18:52:22,954 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 18:52:22,957 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 18:52:22,960 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 18:52:22,960 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 18:52:22,961 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-18 18:52:23,039 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/472bc8c92/e9e6f3b0e4d841acbeee5caeaa8540da/FLAG93a7fef9a
[2020-08-18 18:52:23,739 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 18:52:23,741 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-18 18:52:23,778 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/472bc8c92/e9e6f3b0e4d841acbeee5caeaa8540da/FLAG93a7fef9a
[2020-08-18 18:52:23,949 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/472bc8c92/e9e6f3b0e4d841acbeee5caeaa8540da
[2020-08-18 18:52:23,958 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 18:52:23,960 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 18:52:23,961 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 18:52:23,961 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 18:52:23,964 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 18:52:23,965 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:52:23" (1/1) ...
[2020-08-18 18:52:23,969 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@693e2903 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:23, skipping insertion in model container
[2020-08-18 18:52:23,969 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:52:23" (1/1) ...
[2020-08-18 18:52:23,977 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 18:52:24,170 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 18:52:25,723 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 18:52:25,739 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 18:52:26,890 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 18:52:26,929 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 18:52:26,930 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:26 WrapperNode
[2020-08-18 18:52:26,930 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 18:52:26,931 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 18:52:26,931 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 18:52:26,931 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 18:52:26,945 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:26" (1/1) ...
[2020-08-18 18:52:26,947 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:26" (1/1) ...
[2020-08-18 18:52:27,004 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:26" (1/1) ...
[2020-08-18 18:52:27,005 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:26" (1/1) ...
[2020-08-18 18:52:27,072 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:26" (1/1) ...
[2020-08-18 18:52:27,108 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:26" (1/1) ...
[2020-08-18 18:52:27,120 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:26" (1/1) ...
[2020-08-18 18:52:27,136 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 18:52:27,137 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 18:52:27,137 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 18:52:27,137 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 18:52:27,138 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:26" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 18:52:27,211 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 18:52:27,211 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 18:52:27,211 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 18:52:27,212 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 18:52:27,212 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 18:52:27,213 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 18:52:27,213 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 18:52:27,214 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 18:52:27,214 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 18:52:27,215 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 18:52:27,215 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 18:52:27,216 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 18:52:27,216 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 18:52:27,216 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 18:52:27,216 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 18:52:27,217 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 18:52:27,217 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-08-18 18:52:27,218 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 18:52:27,218 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 18:52:27,218 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 18:52:27,218 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 18:52:27,218 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 18:52:31,290 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 18:52:31,291 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 18:52:31,302 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:52:31 BoogieIcfgContainer
[2020-08-18 18:52:31,303 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 18:52:31,304 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 18:52:31,304 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 18:52:31,307 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 18:52:31,308 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:52:23" (1/3) ...
[2020-08-18 18:52:31,308 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f7464ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:52:31, skipping insertion in model container
[2020-08-18 18:52:31,309 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:52:26" (2/3) ...
[2020-08-18 18:52:31,309 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f7464ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:52:31, skipping insertion in model container
[2020-08-18 18:52:31,309 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:52:31" (3/3) ...
[2020-08-18 18:52:31,311 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-18 18:52:31,322 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 18:52:31,331 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 18:52:31,345 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 18:52:31,375 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 18:52:31,375 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 18:52:31,376 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 18:52:31,376 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 18:52:31,376 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 18:52:31,376 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 18:52:31,376 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 18:52:31,376 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 18:52:31,421 INFO  L276                IsEmpty]: Start isEmpty. Operand 1431 states.
[2020-08-18 18:52:31,460 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 488
[2020-08-18 18:52:31,463 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:52:31,464 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:52:31,465 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:52:31,472 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:52:31,473 INFO  L82        PathProgramCache]: Analyzing trace with hash -1961833088, now seen corresponding path program 1 times
[2020-08-18 18:52:31,482 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:52:31,482 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162632441]
[2020-08-18 18:52:31,483 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:52:33,536 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:35,136 WARN  L193               SmtUtils]: Spent 794.00 ms on a formula simplification that was a NOOP. DAG size: 403
[2020-08-18 18:52:35,138 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:52:35,148 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:36,138 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 18:52:36,139 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162632441]
[2020-08-18 18:52:36,143 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:52:36,143 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 18:52:36,145 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14591751]
[2020-08-18 18:52:36,161 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 18:52:36,162 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:52:36,184 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 18:52:36,185 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 18:52:36,187 INFO  L87              Difference]: Start difference. First operand 1431 states. Second operand 5 states.
[2020-08-18 18:52:53,512 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:52:53,512 INFO  L93              Difference]: Finished difference Result 4236 states and 7632 transitions.
[2020-08-18 18:52:53,515 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-18 18:52:53,517 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 487
[2020-08-18 18:52:53,519 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:52:53,570 INFO  L225             Difference]: With dead ends: 4236
[2020-08-18 18:52:53,570 INFO  L226             Difference]: Without dead ends: 2814
[2020-08-18 18:52:53,584 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-18 18:52:53,614 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2814 states.
[2020-08-18 18:52:53,810 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2814 to 2812.
[2020-08-18 18:52:53,811 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2812 states.
[2020-08-18 18:52:53,825 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2812 states to 2812 states and 4639 transitions.
[2020-08-18 18:52:53,827 INFO  L78                 Accepts]: Start accepts. Automaton has 2812 states and 4639 transitions. Word has length 487
[2020-08-18 18:52:53,829 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:52:53,829 INFO  L479      AbstractCegarLoop]: Abstraction has 2812 states and 4639 transitions.
[2020-08-18 18:52:53,829 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 18:52:53,829 INFO  L276                IsEmpty]: Start isEmpty. Operand 2812 states and 4639 transitions.
[2020-08-18 18:52:53,842 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 490
[2020-08-18 18:52:53,842 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:52:53,843 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:52:53,844 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 18:52:53,844 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:52:53,844 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:52:53,844 INFO  L82        PathProgramCache]: Analyzing trace with hash 39211808, now seen corresponding path program 1 times
[2020-08-18 18:52:53,845 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:52:53,845 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66653720]
[2020-08-18 18:52:53,845 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:52:54,185 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:55,637 WARN  L193               SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 403
[2020-08-18 18:52:55,640 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:52:55,667 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:52:56,280 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 18:52:56,280 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66653720]
[2020-08-18 18:52:56,280 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:52:56,281 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 18:52:56,281 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249796931]
[2020-08-18 18:52:56,283 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 18:52:56,283 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:52:56,284 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 18:52:56,284 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 18:52:56,284 INFO  L87              Difference]: Start difference. First operand 2812 states and 4639 transitions. Second operand 4 states.
[2020-08-18 18:53:16,337 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 18:53:16,338 INFO  L93              Difference]: Finished difference Result 8158 states and 13422 transitions.
[2020-08-18 18:53:16,339 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 18:53:16,339 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 489
[2020-08-18 18:53:16,341 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 18:53:16,369 INFO  L225             Difference]: With dead ends: 8158
[2020-08-18 18:53:16,370 INFO  L226             Difference]: Without dead ends: 5560
[2020-08-18 18:53:16,376 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 18:53:16,384 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 5560 states.
[2020-08-18 18:53:16,558 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 5560 to 5558.
[2020-08-18 18:53:16,558 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 5558 states.
[2020-08-18 18:53:16,579 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 5558 states to 5558 states and 9141 transitions.
[2020-08-18 18:53:16,580 INFO  L78                 Accepts]: Start accepts. Automaton has 5558 states and 9141 transitions. Word has length 489
[2020-08-18 18:53:16,582 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 18:53:16,582 INFO  L479      AbstractCegarLoop]: Abstraction has 5558 states and 9141 transitions.
[2020-08-18 18:53:16,582 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 18:53:16,582 INFO  L276                IsEmpty]: Start isEmpty. Operand 5558 states and 9141 transitions.
[2020-08-18 18:53:16,603 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 491
[2020-08-18 18:53:16,603 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 18:53:16,604 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 18:53:16,605 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 18:53:16,608 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 18:53:16,609 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 18:53:16,609 INFO  L82        PathProgramCache]: Analyzing trace with hash -960654715, now seen corresponding path program 1 times
[2020-08-18 18:53:16,610 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 18:53:16,610 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [671103578]
[2020-08-18 18:53:16,611 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 18:53:16,674 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:53:17,586 WARN  L193               SmtUtils]: Spent 742.00 ms on a formula simplification that was a NOOP. DAG size: 403
[2020-08-18 18:53:17,589 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 18:53:17,597 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 18:53:17,828 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 18:53:17,829 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [671103578]
[2020-08-18 18:53:17,829 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 18:53:17,829 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 18:53:17,829 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818641043]
[2020-08-18 18:53:17,831 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 18:53:17,831 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 18:53:17,831 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 18:53:17,832 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 18:53:17,832 INFO  L87              Difference]: Start difference. First operand 5558 states and 9141 transitions. Second operand 4 states.